According to Jim Episode 2.22 Deal with the Devlins

Cheryl makes friends with another mom from the girls soccer team. The woman is sweet, yet a bit obnoxious. Jim is annoyed by her presence, but Cheryl insists on him being nice to her. Little by little, Cindy starts to get into their lives and tell them what to do and not to do. Jim ends up buying a hot tub from her husband, thinking that might drive them away, but instead it only pulls them closer. They show up unexpectedly on the tub, which is the final drop for Jim. He tells Cheryl it's time for her to come clean and confess to Cindy that they don't like her. Just when she finally does that, Cindy's husband offers Jim season tickets for the Bears. In order to undo the break up he asked Cheryl to do, Jim tells Cindy that Cheryl is under medication for mood swings and that he's willing to do them anything. They move in for a week, while Cheryl decides to take some time off at her sister's "for mental health".